Belarus' Foreign Ministry said in a press release that it had summoned Lithuania's ambassador, Andrius Pulokas, to hand him "the diplomatic note expressing concern of Belarus that it was not promptly notified about the incident at the site of the Ignalina NPP".

The ministry called on Lithuania "to conduct a thorough investigation of the incident and inform Belarus of its results".

The 15min.lt news website reported on Monday that the incident had occurred during the so-called hot tests in late 2017.